//
//  Copyright 2012, Xamarin Inc.
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//
using EmployeeDirectory.Core.Data;

namespace EmployeeDirectory.Core.ViewModels;

public class FavoritesViewModel : ViewModelBase
{
	IFavoritesRepository favoritesRepository;
	bool groupByLastName;

	public ObservableCollection<PeopleGroup> Groups { get; private set; } = new();
	public ObservableCollection<Person> People { get; private set; } = new();

	public bool IsEmpty {
		get {
			return Groups.Count == 0;
		}
	}

	public FavoritesViewModel (IFavoritesRepository favoritesRepository, bool groupByLastName)
	{
		if (favoritesRepository == null)
			throw new ArgumentNullException ("favoritesRepository");

		this.favoritesRepository = favoritesRepository;
		this.groupByLastName = groupByLastName;

		CreateGroups ();

		favoritesRepository.Changed += delegate {
			CreateGroups ();
		};
	}

	private void CreateGroups ()
	{
		People = new ObservableCollection<Person> (favoritesRepository.GetAll ());
		Groups = PeopleGroup.CreateGroups (
			favoritesRepository.GetAll (),
			groupByLastName);
		OnPropertyChanged ("Groups");
	}
}

